mermaid`${td_mermaid_text}`
html`<pre>${td_mermaid_text}</pre>`
td_mermaid_text = `
graph TD;
${fks.map((r) => `${r.table_from}-->${r.table_to};`).join("\n ")}
`
md`## Now try an entity relationship diagram
https://mermaid-js.github.io/mermaid/#/entityRelationshipDiagram`
mermaid`
%%{config: { 'fontFamily': 'Menlo', 'fontSize': 18, 'fontWeight': 400} }%%
${er_mermaid_text}`
html`<pre>${er_mermaid_text}</pre>`
er_mermaid_text = `
erDiagram
${tables
.map(
(table) =>
`${fks
.filter((fk) => fk.table_from == table)
.map(
(fk) => ` ${fk.table_from} ||--o{ ${fk.table_to} : ${fk.column_from}`
)
.join("\n")}\n ${table} {\n ${columns
.filter((o) => o.table == table)
.map((o) => `column ${o.column}`)
.join("\n ")}\n }`
)
.join(" \n")}
`
mermaidJs = require("mermaid@8.14.0/dist/mermaid.min.js")
params = new URL(location).searchParams
initial_url = params.get('url') || 'https://github-to-sqlite.dogsheep.net/github'
tables = [
...new Set([...fks.map((x) => x.table_from), ...fks.map((x) => x.table_to)])
]
columns = fks.map(x => ({ table: x.table_from, column: x.column_from }))
sql = `
select
sqlite_master.name as table_from,
fk_info.[from] as column_from,
fk_info.[table] as table_to,
fk_info.[to] as column_to
from
sqlite_master
join pragma_foreign_key_list(sqlite_master.name) as fk_info
order by
sqlite_master.name
`;
fks = await fetch(
`${database_url}.json?sql=${encodeURIComponent(sql)}&_shape=array`
).then((r) => r.json())
import {form} from "@mbostock/form-input"
mermaid = function (...values) {
const div = viewof mermaidContainer; //document.getElementById('mermaid');
if (!div) {
throw 'Cannot find div with id "mermaid"';
}
const src = String.raw(...values).trim();
const id = "mmd" + Math.round(Math.random() * 10000);
div.append(html`<div id="${id}" />`);
try {
const result = mermaidJs.render(id, src, undefined);
return svg([result]);
} catch (ex) {
console.error(ex);
throw ex;
}
}
viewof mermaidContainer = html`<div id="mermaid" />`
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.